海上风电柔性直流输电变流器的研究与开发  

Flexible direct current transmission converter for offshore wind farm

作　　者：李响[1] 王志新[1] 刘文晋[1] 

机构地区：[1]上海交通大学电气工程系,上海200240

出　　处：《电力自动化设备》2009年第2期10-14,20,共6页Electric Power Automation Equipment

基　　金：上海市白玉兰科技人才基金(2007B073);教育部留学回国科研基金(教外司[2007]1108号);上海市教育发展基金(2006003);中国博士后基金(2005038435)~~

摘　　要：基于可关断电力电子器件和PWM技术,结合海上风电场长距离直流输电的特点,对海上风电柔性直流输电变流器进行了分析和研究。根据变流器主电路拓扑结构建立了系统在三相静止abc坐标系和两相旋转d-q坐标系下的数学模型;变流器控制系统采用双闭环控制,选取前馈解耦控制策略对电流内环的有功、无功电流进行解耦;同时引入电流状态反馈和网侧电压前馈补偿,提高了系统的动态性能和抗干扰能力;系统采用五段式空间矢量PWM调制方法,有效地降低了开关频率,减少开关损耗。仿真结果证明,该变流器适用于海上风电场柔性直流输电系统。The flexible converter for the long-distance DC transmission system of offshore wind farm is studied based on controllable power electronic components and PWM （Pulse Width Modulation） technology. Based on its main circuit topology, mathematical models are established in both three-phase static abc coordinate system and two-phase rotating d-q coordinate system. The feed-forward decoupling strategy is used in its dual close-loop control system to separate active and reactive currents. The current state feedback and AC voltage feed-forward compensation are adopted to improve the dynamic performance and anti-disturbance ability. The five-section SVPWM is used to lower switching frequency and loss. Simulation results show that the proposed converter is suitable for the flexible DC transmission system of offshore wind farm.

关 键 词：柔性直流输电 变流器 双闭环控制 电流状态反馈 电压前馈补偿 空间矢量PWM 

分 类 号：TM721.1[电气工程—电力系统及自动化]